Dynamo-electric machine



June 23, 1925.

J. WILKINSON DYNAMO ELECTRIC MACHIN Filed May 2. 1922 n P om bk m ws be m h Hi 6 Attorn ey.

Patented June 23, 1925.

UNITEDQVSTATES J WILKINSON,

OFLYNN, IASSACHUSETTS, ASSIGNOR T6 GENERAL COMPANY, A CORPORATION OF NEW YORK.

ELECTRIC DYNAIO-ELECTBIC momma Application fled an 2, 1922. Serial no. 551,994.

To all whom it may concern:

vention in a dynamo electric machine 0 Be it known that I, JAMES VVILKINsox,

a citizen of the United States, residing at Lynn, in the county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Dynamo Elect-r'ic Machines, of which the following is a specification.

My invention relates to dynamo electric machines and particularly to the ventilation of such machines. It has for its object an efiicient arrangement for the ventilation of the rotatablemembers of such machines.

In order to obtain the most efficient venti- 'lating arrangement of the rotatable member of a dynamo electric machine, it is necessary that the entrance of air to the suction side of the fan shall be unobstructed, that the air leaving the delivery side of the fan shall be'guided roperl to theparts tobe cooled andthat t e air s all not pass'around sharp corners or overobstructionsr To accomplish this my invention consists of a novel arrangement and construction of the rotatable member of a dynamo electric machine. v v

For a better understanding of my invention, reference may be had to the following description taken in connection with the accompanying drawing, in which Fig. 1 is a sectional view of a dynamo electric machine embodying my invention; Fig. ,2 is an end view of the machine of Fi. 1 with parts removed; Fig. 3-is a sectiona view of a portion of a d namo electric machine embodying a modi cation of my invention; and Fig. 4 IS a sectional view taken on the line 4-4 of Fig. 3.

In the drawings I have illustrated my 11111- t c induction type. Like reference numerals refer to like parts throughout the several figures of the drawing.

Referring to Figs. 1 and 2, 1 is a Stationa member of a dynamo electric machine liaving the usual frame 2 supporting lamination 3 in slots in the inner periphery of which is mounted a winding 4. A rotatable member 5 is mounted on a shaft 6 journ-nled in bearing 7. The rotatable member 5 comprises a spider 8 on which a core consisting of laminations 9 is mounted. The lar'ninations are assembled in bundles, the bundles being spaced apart to form a plurality of radially extending ventilating spaces 10 between the laminations. The

ventilating spaces 102are substantially nni' passages 13 lead from the fan members 12 to the inner ends of the ventilating spaces 10. These passages are closedbythe end members 14 at their ends and by the wal'l 15 of the spider which extendsthrou thout the 1 length of the passages 13. "It-wi 1 be seen.

from the drawing that these passages .13 are wider at the ends adjacent the fan members 12 and are narrower; at the portions thereof ad acent the ventilating spaces 10; The wall- 15 of the passages has a gradual curve so as to prevent the formation of eddycurrents in the an flowing through the passages It will be noted from Fig. 1 that air en-' ters both sides of the machine "throu h the frame 2, enters the suction sideof the fan member 12, passes through the passages 13, through the ventilating spaces 10, cools the windings 11 and 4 and passes out of the machine through the ventilating spaces'in the laminations 3 and out of the frame 2, as indicated by the arrows. With the arrangement shown the entrance of air to the suction side of the fans 12 is unobstructed and the air leavin the delivery side of the fans passes The spider 8'comprises armsu16 on throng the passages 13 without encountering any sharp corners or obstructions.

In the. modification of my invention shown in Fi 3 and L the fan members 12' are arrange at aslight angle to the shaft, whereas in the other figures the fan members 12 are arranged parallel to thd shaft. Also in Figs. 3 and 4, the wall 15' of the spider is curved from the ends adjacent the fan members 12 to the center of the spider 8' thereby makin the passages 13 of different shape than t at shown in Fig. 1 and much narrower at the middle of the machine. In Figs. 3 and 4 also, the ribs 17 are curved in order to facilitate the entrance of air into the ventilating spaces 10, these ribs acting as fan blades and increasing the pressure of the air entering the ventilating spaces.

The direction of normal rotation of the rotatable member is indicated in Figs. 2 and 4 by arrows below these figures, but the fans are designed so that air will be efficiently forced through the ventilating spaces 10 and 10' with a direction of rotation of the rotatable member opposite to that indicated by these arrows.

I desire it to be understood that my invention is not limited to the particular arrangement shown and described, and I aim in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention.

lVhat I claim as new and desire to secure by Letters Patent of the United States is:

1. In a dynamo electric machine, a rotatable member comprising a. spider having longitudinally extending ribs, said ribs being spaced apart, a core consisting of laminations mounted on said ribs and provided with slots, windings in said slots, said laminations being provided with a plurality of radially extending ventilating s aces therebetween, said ventilating spaces eing substantially uniformly spaced throughout the length of said core,- fan members mounted .on said spider at the ends thereof, and means forming substantially enclosed passages leading from said fan members to the inner ends of said ventilating spaces, said passages bein wider at the ends adjacent the fan mem ers and narrower at the portions thereof adjacent the said ventilating spaces, said ribs of said spider being located in said passages and extending in the direction of said passages so as to form a plurality of paths for the air from each of said fan members. 7

2. In a dynamo electric machine, a. rotatable member comprising a spider havin longitudinally extending curved ribs, sai ribs being spaced apart, a core consisting of laminations mounted on said ribs and provided with slots, windin in said slots, said laminations being provi ed with a plurality of radially extending ventilating s es therebetween, said ventilating spaces ing substantially uniformly spaced throughout the length of said core, fan members mounted on said spider at the ends thereof, andmeans formin substantially enclosed passages leading rom said fan members to the inner ends of said ventilating spaces, said ribs of said spider being located in said passages and extending in the direction of said passages so as to form a plurality of paths for the air from each of said fan members, whereby said ribs act as fan blades to increase the pressure of the air entering said ventilating spaces.

3. In a dynamo electric machine, a rotatable member comprising a spider havin longitudinally extending curved ribs, sai ribs being spaced apart, a core consisting of laminations mounted on said spider and provided with slots, windings in said slots, said laminations being provided with a plurality of radially extending ventilating spaces therebetween, said ventilating spaces being substantially uniformly spaced throughout the length of said core, fan

members mounted on said spider at the ends thereof, and means formin substantially enclosed passages leading rom said fan members to the inner ends of said ventilating spaces, said assages being wider at the ends adjacent e fan members and narrower at the portions thereof adjacent the said ventilating games, said ribs of said spider being locat in said passages and ex tending in the direction of said passages so as to form a plurality of aths for the air from each of said fan mem ers whereby said ribs act as fan blades to increase the pressure of the air entering said ventilating spaces.

In witness whereof, I have hereunto set my hand this 29th day of. April 1922.

' JAMES WILKINSON. 

